Elastic Collisions

What is momentum? Well, if u don't know what it is I can explain it to you. Momentum is the force times the speed of an object. And you can compare momentums between objects. 

- What has a greater momentum; a train at stationary or a moving skateboard...

    Of course, the moving skateboard has a greater momentum.  You must be asking " but why if the train weighs more than a skateboard?" Blah blah blah... Yes it's true a train weighs more but in this case when you want to find momentum you need the objects force (kg) times the objects speed (m). So, the train is at rest which isn't moving and the skateboard is moving. So, in this case the skateboard has the most momentum because it's moving a weight. And the train is at rest not moving at all which isn't doing work for train to move its weight. 😃👌🏼✏️

Work vs Power

The difference between work and power is that work is is the amount of force you do on an object so it can move at a certain distance. And power is the rate of how much work you put on an object. 

To find work you ONLY need force x distance. 

And to find the power you need work/ change of time.  

For work time doesn't matter BUT in power time DOES MATTER. 😄👌🏼✖️➗

Examples; 

Work done nd lots of power- An example of someone doing work with lots of power is a weight lifter picking up a 50 pound weight above his head with the time of 3s. And the second weightlifter is lifting the same weight but at the time of 10s. Which weightlifter has more power?

Well the second weight lifter because it's takin him more time to lift the same weight at the same distance. 

The one with less time is an expanse of little power because he's not taking all of his power to lift the weight up. 

Inertia investigation

What is inertia? Inertia is the natural tendency of an object to remain still or to keep moving. 

      3 instances I saw inertia in my life are;

A) one example of inertia I've seen is when I'm buying food. When I'm pushing the food cart and I let it go it would naturally want to keep moving. It doesn't want to stop because it has been moving and which is inertia   The cart will not stop unless you hold the cart with your hand and make it stop or there is some object preventing it to keep moving. 

B) second example of inertia is when I'm playing bowling ball. When I roll the bowling ball it would keep going in that direction. The bowling's ball inertia is to keep moving because I'm making it roll. So, in other words the ball will not stop until it reaches the end of the way or it hits the pins. 

C) the third example is when I leave my iPad on the table. This iPad's inertia is to stay still. Why? Well because it wasn't moving it doesn't want to move unless I force  it to move. So this is an example is inertia when staying still. 

      These are the examples of inertia in my life, but one example of when one thing is moving and the other one is not moving is: 

         When people are in the roller coaster the cart is moving every where but the people on it basically doesn't move because they are still sitting enjoying the ride. 😌👌🏼🎢

Mu Friction

Why would friction happen? I think friction happens because everything has to stop at some point. And if it doesn't stop then friction well be the cause of an object stopping. 

   Another surface I think would have an even bigger value of mu with my shoe would be a Rocky Mountain surface. I think this because the rocks would make the shoe less able to slide cuz the surface is rough. 😋👌🏼

Balanced & Unbalanced

This free body diagram shows a balanced object. In other words this object is being pulled and pushes with the same force. How do I know. Well if you see in the diagram both sides  left to right have both with 5n forces. Which means that the object is balanced. 

In this free body diagram the objects are being pulled with different forces. Which means that the object doesn't have a balanced force. So it's unbalanced. This means that the object is being pulled with a string downwards. Because as you can see  the normal force is 600N and the gravational force is 800N which shows that the force isn't balanced because 800 is greater than 600  newtons. 

vector & scalar

                                                             Scalar & Vector


           The difference between scalar and vector is that a vector is a quantity showing the direction and the amount of something. 

Vector - example; the velocity of a car is 3 m/s to the left. This description of the velocity is showing the direction (left) and the amount of something ( velocity). 

            The scalar is also showing the amount of something but without a direction. 
         
         example;  the velocity of the car is 3 m/s. This description of the velocity is showing the amount of something ( velocity).  


           

"Free Body Diagram"

This object is a book and it is moving to the right with acceleration. 

-in this diagram it shows 4 different forces to this object;

  1) Fnorm means normal force which is the force that any object has normally. In this diagram it shows that the book has normal force which is equal to the gravitational force. These are the force that go vertically. 

  2) Fgrav means the gravatational force that the object has from the gravity of earth which is pulling the book down. In this diagram the gravatational force is equal to the normal force. As you can see if you see the vertical forces. 

  3) Ffrict means the force of the friction tht the object when it is being pushed to the right. Which could be the floor or it could be a wall making that force against the book. As you can see in this diagram above it shows that the friction force is small which means that it has friction but it's not a lot. 

  4) The last force shown in this diagram is Fapp which is the applied forced. This force is called this wat because this is the force your are applying to the book so it could move to the ight. As you can see in this diagram the applied force arrow is more than the arrow of the force friction. So this means that the book is unbalanced because the forces horizontally are not equal to each other.